powered by the biggest engine available by GE themselves, the HDL series, instead of a modified 7FDL16 powering the AC55CWI in an AC6000CW shell, now it has 7500 horsepower, 25% more power than stock, a few modifications were made to diffirenciate teh AC75CWI from the AC55CWI like the nickname, a triple headlight beam instead of a mars light, new stack, but else it is as more multipurpose as the very common ET44 looking AC55CWI loco